小编blu*_*lue的帖子

背景: 我有2个服务器,所有os内核版本都是4.18.7,它有CONFIG_BPF_SYSCALL = y

我创建了一个shell脚本'x.sh'

i=0 
while (( i < 1000000 )) 
do (( i ++ )) 
done

并运行命令: perf stat ./x.sh

所有的shell版本都是"4.2.6(1)-release"

S1: CPU - Intel(R)Xeon(R)CPU E5-2630 v4 @ 2.20GHz,以及微码 - 0xb00002e和perf stat结果

   5391.653531      task-clock (msec)         #    1.000 CPUs utilized          
             4      context-switches          #    0.001 K/sec                  
             0      cpu-migrations            #    0.000 K/sec                  
           107      page-faults               #    0.020 K/sec                  
12,910,036,202      cycles                    #    2.394 GHz                    
27,055,073,385      instructions              #    2.10  insn per cycle         
 6,527,267,657      branches                  # 1210.624 M/sec                  
    34,787,686      branch-misses             #    0.53% of all branches …